TetRemoveResultsTask

`construct.tet.remove_results`: take the results of a solve off a tet volume, as Tet ▸ Remove results does (construct-fea-solve §FEO-1).

In the namespace construct::opal. Declared in src/libs/libconstruct/construct/opal/FeaSolveTasks.hpp.

Detailed description

One undo step removes `feaSolve`, the `fieldInfo` entries of the four result fields, and a color presenter that shows one of them. The file keeps its fields.